VS Code does not properly interpret GitHub Copilot in-chat code references

[garretwilson]

1. Create a multi-root VS Code workspace with the first (default) root set to /c/path/foo and another root /c/path/bar.
2. Discuss code in /c/path/foo in GitHub Copilot chat.
3. The LLM will generate a link such as (Markdown):

   **Direct invocation path** ([lines 171-179](cloud-provider-aws/src/main/java/dev/flange/cloud/provider/aws/AbstractAwsCloudFunctionServiceHandler.java#L171-L179)):

4. Try to click on the link "lines 171-179".

Expected: Clicking on the link will open /c/path/foo/cloud-provider-aws/src/main/java/dev/flange/cloud/provider/aws/AbstractAwsCloudFunctionServiceHandler.java and highlight the indicated lines

Actual: VS Code shows an error dialog with the title "Unabled to open 'AbstractAwsCloudFunctionServiceHandler.java..." and the message "The editor could not be opened because the file was not found."